JPH1022143A - Method and device for abnormality diagnoses of tap switching device under load - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attach a torque sensor without disconnecting a connection driving axis and to allow post-attaching with ease by, relating to an abnormality diagnoses device for a tap switching device under load, providing the driving axis with a detachable torque sensor. SOLUTION: A driving axis for transmitting a driving force for switching operation of a tap switching device under load comprises, including occasion for manual operation, a manual operation handle axis 22, an output driving axis 231 for an deceleration mechanism and a connection driving axis 3, and a detachable torque sensor 6 is attached to one of them: Since the connection driving axis 3 is longer than other driving axis parts, a place appropriate for attaching the detachable torque sensor 6 is easy to be selected. The output wave form, wherein distortion in accordance with driving torque is detected, detected with the detachable torque sensor 6 is analyzed with an analysis/ diagnosis part 5, and judged as normal if the result is within a preset limit, and judged as abnormal if it exceeds the limit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load tap changer abnormality diagnosis device and a load diagnosis method for performing abnormality diagnosis of a load tap changer provided in a transformer or the like.

[0002]

2. Description of the Related Art A method of measuring a torque waveform generated on a drive shaft of a load tap changer at the time of tap change with a torque sensor and analyzing the waveform to diagnose an abnormality of the load tap changer is described in, for example, Tokuhei 7-75211
Has already been proposed. However, what kind of mounting method is used for the torque sensor, and which part of the drive shaft of the load tap changer is to be mounted on the drive shaft,
No specific method has been proposed. However, the conventional method can be known from an actual application example, but most of the methods adopt the method as shown in FIG. 6. Therefore, a specific conventional method will be described with reference to FIG.

In FIG. 6, reference numeral 1 denotes an on-load tap changer housed in a transformer tank 11, 2 denotes an operation mechanism for switching the on-load tap changer, and 3 denotes an operation mechanism 2 and the on-load tap changer 1. And a connection drive shaft for transmitting the driving force from the operating mechanism 2 to the load tap changer 1 by connecting the two. The vertical connection drive shaft 31 of the connection drive shaft 3 is an upper vertical connection drive shaft 31.
1 and a lower longitudinally connected drive shaft 312.

[0004] Reference numeral 4 denotes a fixed torque sensor inserted in series between the upper vertical connection drive shaft 311 and the lower vertical connection drive shaft 312. One end of the torque detection shaft 41 is connected to the upper vertical connection drive shaft 311. The other end is connected to the lower vertical connection drive shaft 312, and the casing 42 is fixedly supported on the side wall of the transformer tank 11 and covers the torque detection shaft 41. Reference numeral 5 denotes an analysis / diagnosis unit that analyzes an output waveform from the torque sensor 4 and diagnoses an abnormality. The analysis and diagnosis unit 5 compares the output waveform with a pre-stored reference waveform in the same manner as a method that is already widely practiced. Diagnose the existence and output the result.

Next, the operation will be described. The driving force from the operating mechanism 2 is transmitted to the on-load tap changer 1 via the connecting drive shaft 3, and the tap is changed. Since the torque detecting shaft 41 of the fixed torque sensor 4 is inserted in series in the rotational driving force transmission path as described above, it directly receives the driving torque at the time of the switching operation of the on-load tap changer 1.
The torque detecting shaft 41 detects the driving torque at the time of this switching operation and outputs the waveform. The output waveform is analyzed by the analysis / diagnosis unit 5, and the presence or absence of an abnormality is diagnosed, and the result is output.

[0006]

The above-described conventional apparatus and method for diagnosing an abnormality of a tap changer have the following problems.・ Because the torque sensor is inserted in the middle of the connecting drive shaft,
The connection drive shaft, which should be a continuous integral shaft, is divided and the number of connection points increases, and the mechanism reliability of the connection drive shaft decreases. -When retrofitting to an existing on-load tap changer, it is not easy to apply because it requires major modifications such as disconnection and separation of the connection drive shaft and installation of a torque sensor housing mounting base. -Since the installation of the torque sensor is fixed, the installed torque sensor is dedicated to the target load tap switching device. That is, a dedicated torque sensor must be provided for each load tap changer, which is uneconomical.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. It is possible to mount a torque sensor without disconnecting a connecting drive shaft, and it is necessary to modify the existing load tap changer. It is an object of the present invention to provide an abnormality diagnosis device and an abnormality diagnosis method for a load tap changer, which can be easily retrofitted without any trouble, and can perform abnormality diagnosis using a plurality of tap changers under load with one torque sensor. .

[0008]

An apparatus for diagnosing an abnormality of a tap changer under load according to the present invention includes a detachable torque sensor detachable from a drive shaft.

Further, the method for diagnosing an abnormality of a tap changer under load according to the present invention uses a detachable torque sensor detachable from a drive shaft. Further, a detachable torque sensor is mounted on a connection drive shaft connecting the load tap changer and the operating mechanism. Further, a detachable torque sensor is mounted on a drive shaft in the operation mechanism. Also, a detachable torque sensor is mounted on the handle shaft for manual operation.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a schematic view of an on-load tap switching device according to a first embodiment of the present invention. In the drawing, reference numeral 1 denotes a on-load tap switching device, which includes contacts for switching taps of a transformer winding (not shown). Consisting of a transformer tank 11
It is stored in. Reference numeral 2 denotes an operation mechanism for performing a switching operation of the on-load tap changer 1, and 3 denotes a connection drive shaft.
And an on-load tap changer 1 connected to an operating mechanism 2
Is transmitted to the tap changer 1 under load. Reference numeral 6 denotes a detachable torque sensor having a structure described later with reference to FIG. Reference numeral 5 denotes an analysis and diagnosis unit that analyzes an output waveform from the detachable torque sensor and diagnoses an abnormality.

Reference numeral 21 denotes a drive motor for electrically operating the tap changer 1, reference numeral 22 denotes a handle shaft for manual operation for manually operating the tap changer, and reference numeral 23 denotes rotation of the drive motor 21 and the handle shaft 22. A deceleration mechanism for decelerating the rotation to a rotation speed suitable for driving the load tap changer 1, and 231 is an output drive shaft thereof. The operation mechanism 2 includes a drive motor 21, a handle shaft 22, a speed reduction mechanism 23, and a case 24 for accommodating them.

The connection drive shaft 3 comprises a vertical connection drive shaft 31 and a horizontal connection drive shaft 32. The lower end of the vertical connection drive shaft 31 is connected to the output drive shaft 231 of the reduction mechanism 23, and the upper end is a directional deflection gear mechanism. 33. In the figure, the right end of the lateral connection drive shaft 32 is connected to the directional deflection gear mechanism 33, and the left end is connected to the tap changer 1.

The drive shaft for transmitting the driving force for performing the switching operation of the on-load tap changer includes a handle shaft 22 for manual operation including manual operation, and an output drive shaft 2 for the reduction mechanism.
A detachable torque sensor 6 may be attached to any of these components. In this embodiment, the detachable torque sensor 6 is attached to the longitudinally coupled drive shaft 31.

FIG. 2 is a perspective view showing the structure of the detachable torque sensor 6. Reference numerals 61 to 64 denote four mounting portions, which form a set of mounting portions 61 and 62, and mounting portions 63 and 64.
Form another set. The mounting portion 61 is formed with a semi-cylindrical surface 68 that fits the vertical connection drive shaft 31.
Two fastening portions 6 are formed from both ends in the circumferential direction of the semi-cylindrical surface 68.
7 are provided so as to extend in opposite directions to each other.

The other mounting portions 62 to 64 have the same configuration, but the mounting portions 61 and 63 are provided integrally with a bridge 65 for torque detection. That is, the bridge extending in the direction parallel to the axis of the semi-cylindrical surface 68 is attached to both mounting portions 61 and 63.
It is shaped like a bridge between them. Reference numeral 66 denotes a bolt as a fastening tool. The mounting portions 61, 62 and 63, 64 are combined one by one so that the semi-cylindrical surfaces face each other to form a cylindrical surface. To tighten.

Next, the operation will be described with reference to FIG. In performing the abnormality diagnosis, first, the semi-cylindrical surface 68 is fitted to the longitudinally connected drive shaft 31, and the detachable torque sensor 6 is securely attached with the bolt 66 as shown in FIG. When the drive motor 21 starts rotating by an electric operation command from a command unit (not shown) or the handle shaft 22 starts rotating by manual handle operation, these rotations are transmitted to the drive of the load tap changer 1 by the speed reduction mechanism 23. The speed is reduced to an appropriate number of revolutions and output to the output drive shaft 231. The rotation of the output drive shaft 231 is transmitted to the on-load tap changer 1 via the vertically connected drive shaft 31, the directional deflection gear mechanism 33, and the horizontally connected drive shaft 32 connected thereto. Is switched.

The load tap changer 1 is connected to the longitudinally connected drive shaft 31.
When the drive torque at the time of the switching operation is applied, the longitudinally connected drive shaft 31
At the same time, a distortion corresponding to the driving torque is also generated in the torque detection bridge 65 of the detachable torque sensor 6, and the torque detection bridge 65 detects this distortion by a known distortion detection method and outputs its waveform. . The output waveform is analyzed by the analysis / diagnosis unit 5, and if it is within a preset limit, it is determined to be normal. If it exceeds the limit, it is determined to be abnormal, and the result is output.

The detachable torque sensor 6 has been described as an example of a two-part bolt tightening type as shown in FIG. 2. However, the present invention is not limited to such a method, and the same operation and effect can be obtained with a detachable type. In the first embodiment, the detachable torque sensor 6 is attached to the connection drive shaft 3. Since the connecting drive shaft 3 is longer than the other drive shaft portions, it is easy to select a portion suitable for mounting the detachable torque sensor 6.

Embodiment 2 The mounting position of the detachable torque sensor is not limited to the connection drive shaft, but may be a third embodiment described later.
There are various types as shown below. If the mounting location is different, the model of the tap change device under load is different, or the manufacturer of the tap change device under load is different, the diameter of the drive shaft to which the detachable torque sensor is mounted changes.
To deal with this, the semi-cylindrical surface 68 shown in FIG.
It is necessary to prepare many kinds of detachable torque sensors 6 having different diameters.

However, by inserting an adapter between the drive shaft on which the detachable torque sensor 6 is mounted and the semi-cylindrical surface 68, it is not necessary to increase the number of detachable torque sensors. FIG. 3 is a perspective view of the adapter 7, which will be described with reference to FIG. Reference numeral 71 denotes a first having the same diameter as the semi-cylindrical surface 68 of the detachable torque sensor 6.
A semi-cylindrical surface 72 is a second semi-cylindrical surface having a smaller diameter than the first semi-cylindrical surface 71, and these are formed coaxially so that the entire adapter 7 has a semi-cylindrical shape. .

The semi-cylindrical surface 68 of the detachable torque sensor 6
Is set to the one with the largest diameter among the drive shafts to be mounted. For the diameter of the second semi-cylindrical surface 72 of the adapter 7, several types of adapters are prepared according to the diameter of the drive shaft to be attached. At the time of mounting, one adapter 7 is used for each of the mounting portions 61 to 64, that is, a total of four adapters are used. First, the adapter 7 having a size suitable for the mounting shaft 31 is selected, and the second semi-cylindrical surface 72 is fitted to the vertical connection drive shaft 31, and the first semi-cylindrical surface 71 is attached to the detachable torque sensor 6. Semi-cylindrical surface 68
And tightened with bolts 66. Then, the abnormality diagnosis of the tap changer 1 is performed as described in the first embodiment.

In addition, in order to secure the mounting and to accurately detect the driving torque, the semi-cylindrical surface 68 of the detachable torque sensor 6 is formed with some thin and shallow grooves in the axial direction. The first semi-cylindrical surface 71 may be provided with a streak projecting corresponding to the groove. Alternatively, the adapter 7 may be divided into a plurality in the radial direction, and some of the adapters may be used from the outside of the adapter 7 so as to be able to cope with a plurality of drive shaft diameters.

Embodiment 3 FIG. In the first embodiment, the detachable torque sensor 6 is attached to the connection drive shaft 3, but in this embodiment, as shown in FIG. 4, the torque sensor 6 is attached to the output drive shaft 231 of the speed reduction mechanism 23 in the operation mechanism 2. is there. Also in this case, abnormality diagnosis of the tap changer can be performed in the same manner as in the first embodiment.

According to the third embodiment, the following effects can be obtained. Generally, a safety protection cover (not shown) is installed on the connection drive shaft 3. Therefore, when the detachable torque sensor 6 is mounted on the connection drive shaft 3 as in the first embodiment, Therefore, it is necessary to deal with this protective cover. That is, when the detachable torque sensor 6 is permanently mounted, the protective cover needs to be changed to a structure capable of storing the detachable torque sensor 6, and when the existing device is temporarily mounted such as for periodic inspection of the existing device. , It is necessary to remove the protective cover in advance.

On the other hand, in the case of mounting on the output drive shaft in the operation mechanism 2 as in this embodiment, the operation mechanism 2
Since the case 24 is usually provided with a door (not shown), the door can be opened and the detachable torque sensor 6 can be mounted, so that there is no need to change or remove the protective cover and perform pre-operation. Become.

Embodiment 4 FIG. 5 shows a case where the detachable torque sensor 6 is mounted on a handle shaft 22 for manual operation in the operation mechanism 2. When the handle shaft 22 starts rotating by the manual handle operation, the rotation is transmitted to the on-load tap changer 1 via the speed reduction mechanism 23 and the connection drive shaft 3, and the on-load tap changer 1 is switched. When a drive torque at the time of the switching operation is applied to the handle shaft 22, a distortion corresponding to the drive torque is generated in the torque detection bridge 65 of the detachable torque sensor 6 shown in FIG. 2 together with the handle shaft 22. In the same manner as in the first embodiment, it is possible to diagnose the abnormality of the tap changer 1 under load.

In this embodiment, since the detachable torque sensor 6 is mounted on the handle shaft 22 for manual operation, this method is effective only when operated from the handle shaft 22.
Therefore, this method is suitable for a case where the device is attached and periodically diagnosed, for example, in a regular inspection of the on-load tap switching device. Further, there is an advantage that it is not necessary to remove the protective cover of the connection drive shaft 3. Further, even when the space around the connection drive shaft 3 and the output drive shaft 231 of the reduction mechanism 23 is narrow, the detachable torque sensor 6 cannot be mounted. Since a sufficient space for the handle operation is secured around the handle shaft 22, there is an advantage that this method can be applied without any problem.

Even if the handle shaft 22 is not long enough to mount the detachable torque sensor 6,
An application is possible by attaching an extension shaft (not shown) to the handle shaft 22 and attaching the detachable torque sensor 6 to the elongated handle shaft.

[0029]

As described above, the abnormality diagnosis device and the abnormality diagnosis method for the on-load tap changer according to the present invention use the detachable torque sensor detachable from the drive shaft. There is no need to cut off the drive shaft or increase the number of connection points, and therefore, it is possible to perform abnormality diagnosis without impairing the mechanism reliability of the on-load tap switching device. An abnormality diagnosis can be performed for an existing on-load tap switching device by attaching a detachable torque sensor without modifying the drive shaft.

Furthermore, since the detachable torque sensor can be attached and detached as required, if this detachable torque sensor and the analysis / diagnosis unit are rotated, it is possible for a single abnormality diagnosis device to detect the abnormalities of many load tap changers. Diagnosis is possible and extremely economical. When it is desired to periodically perform an abnormality diagnosis using the opportunity of the periodic inspection of the on-load tap switching device, this method of carrying around has an extremely high practical effect.

Further, by mounting the detachable torque sensor on the connecting drive shaft, it is easy to select a mounting location.
Further, by attaching the detachable torque sensor to the drive shaft in the operation mechanism, it is not necessary to change or remove the protective cover of the connection drive shaft. In addition, by attaching the detachable torque sensor to the manual handle shaft, it is not necessary to change or remove the protective cover of the connection drive shaft, and even if the periphery of other parts of the drive shaft is narrow, the detachable torque sensor can be used. Diagnosis can be performed by attaching a sensor.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an on-load tap switching device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a detachable torque sensor used in Embodiment 1 of the present invention.

FIG. 3 is a perspective view showing an adapter used in Embodiment 2 of the present invention.

FIG. 4 is a schematic diagram of an on-load tap switching device according to a third embodiment of the present invention.

FIG. 5 is a schematic diagram of an on-load tap switching device according to a fourth embodiment of the present invention.

FIG. 6 is a schematic view of a load tap switching device showing a conventional method of diagnosing a load tap changer abnormality.

[Explanation of symbols]

1 Tap changer under load, 2 operating mechanism, 3 connected drive shafts, 5 analysis / diagnosis unit, 6 detachable torque sensor, 7
Adapter, 22 handle axis, 61-64 mounting part,
65 bridge, 66 bolt, 67 fastening part, 68
Semi-cylindrical surface, 71 first semi-cylindrical surface, 72 second semi-cylindrical surface, 231 output drive shaft.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Kazuhiro Mizuno 1 Higashi-Shinmachi, Higashi-ku, Nagoya City, Aichi Prefecture Inside Chubu Electric Power Co. (72) Inventor Kazunari Higuchi 1 Higashi-Shinmachi, Higashi-ku, Nagoya City, Aichi Prefecture Chubu Electric Power Stock In company

Claims (5)

[Claims] An analysis of a torque sensor mounted on a drive shaft for transmitting a driving force for performing a switching operation of a load tap changer and a generated torque waveform detected by the torque sensor at the time of tap change. An on-load tap changer abnormality diagnosis device comprising: an analysis diagnosis section for performing an abnormality diagnosis of an hour tap changer, wherein a torque sensor is a detachable torque sensor detachable from the drive shaft. Diagnosis device for tap changers. 2. A torque sensor is mounted on a drive shaft for transmitting a driving force for performing a switching operation of a load tap changer, and a generated torque waveform detected by the torque sensor at the time of tap change is analyzed. In a load tap changer abnormality diagnosis method for performing a tap changer abnormality diagnosis,
A method of diagnosing an abnormality in a tap changer under load, wherein a detachable torque sensor detachable from the drive shaft is used as the torque sensor. 3. The torque sensor according to claim 2, wherein a detachable torque sensor is mounted on a connection drive shaft that connects the on-load tap changer and an operating mechanism for switching the on-load tap changer. Diagnosis method of load tap changer under load. 4. A detachable torque sensor is mounted on a drive shaft in an operating mechanism that is connected to a load tap changer by a connection drive shaft and performs a switching operation of the tap changer. Abnormality diagnosis method of the tap changer under load described in the above. 5. A detachable torque sensor is mounted on a handle shaft for manual operation which is connected to a tap changer under load by a connecting drive shaft to manually perform a switching operation of the tap changer. 3. The method for diagnosing an abnormality of a tap changer under load according to claim 2.